Lots of existing hardware using more than 2W/GHS will start to get unprofitable soo, and some of it wil be turned off, or resold to poor souls who plugs in in, realises it is bad, and tries to shift it on. The 2W/GHS will be profitable a little longer.

We have the 1W/GHS units coming up (Antminer S2, KnC and others). They will be profitable longer. But I see most of the units running today being turned off within the next year. If many gets out from the mining business, maybe we will have a difficulty decrease ? Or a slow increase in difficulty.

Profitability in mining lies with the success of getting peple to not buy more equipment, and turn their old stuff off. Difficulty increase needs to slow down. Lst one was 12% instead of the 20% before that. High difficulty increase can only be caused by new hardware. And since there is so much hardware out there, I don't see it increasign that much any more. I see it slowing down.